My short steel cable is strong enough that it's not easily cut with a long knife/hunting knife. It probably can be eventually cut through, but the time it will take to do so will draw attention for their efforts. The lock is strong enough and though any lock CAN be picked [ for the most part ] it's very unlikely to be picked by your average walker by seeing the helmet cabled to the bike.(with respect to all)
well, whatever makes you feel like you're protecting it is probably better than nothing.
The cable is not the weak link, but it's the lock and those locks are flimsy. Even the heft of my Master lock can be picked with the right tool (and the right tool is needed). To get a "pick-proof" lock you're looking at over $200 USD and they have a useless design for our purposes.
Webbing can be cut easily with a sharp knife, razor blade, heavy duty scissors, so even though there may be aircraft grade metal involved---and is aircraft grade resistant to cutting or just light and strong for it's weight IOW a marketing term?---and, webbing is webbing, just like the straps in your helmet. Bicycle U-Locks are notorious for being easy to defeat.
What I wanted was something SHORT, ie not 2 feet, specific for the helmet and strong and resistant to a passer-by with common tools in their pocket--like a swiss army knife or a hunting knife or a Leatherman---and evil intent.
Maybe I am being overly paranoid about the whole thing, but testimonials are pretty worthless if it happens to you. I could say I've ridden close to 300k miles with no instance of even attempted theft, but would that make anyone feel better? So maybe it is not a problem...or it is a problem and we are all lucky that the right thief did not come along. Or it's possible that even minimum protection is enough to deter?
But good discussion!
I will say that on the road, I almost never see helmets secured, but usually just hung on a mirror.
And rain is part of the experience, often the easy part. I hope it doesn't snow or hail or sleet, or climb above 105 is West Texas, but when you're hundreds or thousands of miles from your garage, you really don't have any control over that. But, you can try to control who would steal your protection.
My set up isn't meant to keep a pro from taking the helmet, it's to prevent the theft of opportunity by the helmet just hanging on a mirror or sitting on the seat. I use the cable and lock when I'm going to walk away from the bike for any length of time like motorcycles on main night, but there's hundreds of people milling about checking out the scoots lining both sides of the street for 3 blocks. My set up will prevent a grab and go, not a pro, but that's exactly it's purpose, to prevent the grab and go thefts.
In that regard, my plastic coated steel braided cable and lock are perfectly acceptable for preventing grab and go's of both the jacket and helmet based on venue.